@unpublished {29334,
	title = {Invariant pencils for polynomial selfmaps of the affine plane},
	year = {2016},
	url = {http://scholar.pku.edu.cn/sites/default/files/xiejunyi/files/affpensx201512261.pdf},
	author = {Mattias Jonsson and Elizabeth Wulcan and Junyi Xie}
}
